From: Wu Fengguang <fengguang.wu@intel.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>, Elladan <elladan@eskimo.com>,
Nick Piggin <npiggin@suse.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Peter Zijlstra <peterz@infradead.org>,
Rik van Riel <riel@redhat.com>, "tytso@mit.edu" <tytso@mit.edu>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"minchan.kim@gmail.com" <minchan.kim@gmail.com>
Subject: Re: [PATCH 2/3] vmscan: make mapped executable pages the first class citizen
Date: Wed, 20 May 2009 10:31:01 +0800 [thread overview]
Message-ID: <20090520023101.GA8186@localhost> (raw)
In-Reply-To: <20090520105159.743B.A69D9226@jp.fujitsu.com>
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On Wed, May 20, 2009 at 09:59:05AM +0800, KOSAKI Motohiro wrote:
> > On Tue, May 19, 2009 at 08:28:28PM +0800, KOSAKI Motohiro wrote:
> > > Hi
> > >
> > > 2009/5/19 Wu Fengguang <fengguang.wu@intel.com>:
> > > > On Tue, May 19, 2009 at 04:06:35PM +0800, KOSAKI Motohiro wrote:
> > > >> > > > Like the console mode, the absolute nr_mapped drops considerably - to 1/13 of
> > > >> > > > the original size - during the streaming IO.
> > > >> > > >
> > > >> > > > The delta of pgmajfault is 3 vs 107 during IO, or 236 vs 393 during the whole
> > > >> > > > process.
> > > >> > >
> > > >> > > hmmm.
> > > >> > >
> > > >> > > about 100 page fault don't match Elladan's problem, I think.
> > > >> > > perhaps We missed any addional reproduce condition?
> > > >> >
> > > >> > Elladan's case is not the point of this test.
> > > >> > Elladan's IO is use-once, so probably not a caching problem at all.
> > > >> >
> > > >> > This test case is specifically devised to confirm whether this patch
> > > >> > works as expected. Conclusion: it is.
> > > >>
> > > >> Dejection ;-)
> > > >>
> > > >> The number should address the patch is useful or not. confirming as expected
> > > >> is not so great.
> > > >
> > > > OK, let's make the conclusion in this way:
> > > >
> > > > The changelog analyzed the possible beneficial situation, and this
> > > > test backs that theory with real numbers, ie: it successfully stops
> > > > major faults when the active file list is slowly scanned when there
> > > > are partially cache hot streaming IO.
> > > >
> > > > Another (amazing) finding of the test is, only around 1/10 mapped pages
> > > > are actively referenced in the absence of user activities.
> > > >
> > > > Shall we protect the remaining 9/10 inactive ones? This is a question ;-)
> > >
> > > Unfortunately, I don't reproduce again.
> > > I don't apply your patch yet. but mapped ratio is reduced only very little.
> >
> > mapped ratio or absolute numbers? The ratio wont change much because
> > nr_mapped is already small.
>
> My box is running Fedora 10 initlevel 5 (GNOME desktop).
>
> many GNOME component is mapped very many process (likes >50).
> Thus, these page aren't dropped by typical any workload.
Yeah, that's possible (but sounds bloated in regard of active
working set size).
> > > I think smem can show which library evicted. Can you try it?
> > >
> > > download: http://www.selenic.com/smem/
> > > usage: ./smem -m -r --abbreviate
> >
> > Sure, but I don't see much change in its output (see attachments).
> >
> > smem-console-0 is collected after fresh boot,
> > smem-console-1 is collected after the big IO.
>
> hmmmm, your result has following characatistics.
>
> - no graphics component
> - very few mapped library
> (it is almost only zsh library)
>
> Can you try test on X environment?
Sure, see the attached smem-x-0/1. This time we see sufficient differences.
> > > We can't decide 9/10 is important or not. we need know actual evicted file list.
> >
> > Right. But what I measured is the activeness. Almost zero major page
> > faults means the evicted 90% mapped pages are inactive during the
> > long 300 seconds of IO.
>
> Agreed.
> IOW, I don't think your test environment is typical desktop...
Kind of :) It's fluxbox + terminal + firefox, a bare desktop for
testing things out.
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[vsyscall] 15 0 0
[vdso] 15 0 0
next prev parent reply other threads:[~2009-05-20 2:31 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-16 9:00 [PATCH 0/3] make mapped executable pages the first class citizen Wu Fengguang
2009-05-16 9:00 ` [PATCH 1/3] vmscan: report vm_flags in page_referenced() Wu Fengguang
2009-05-16 13:17 ` Johannes Weiner
2009-05-16 13:37 ` Rik van Riel
2009-05-17 0:35 ` Minchan Kim
2009-05-17 1:36 ` Minchan Kim
2009-05-17 1:58 ` Wu Fengguang
2009-05-16 9:00 ` [PATCH 2/3] vmscan: make mapped executable pages the first class citizen Wu Fengguang
2009-05-16 9:28 ` Wu Fengguang
2009-05-16 13:20 ` Johannes Weiner
2009-05-17 0:38 ` Minchan Kim
2009-05-18 14:46 ` Christoph Lameter
2009-05-19 3:27 ` Wu Fengguang
2009-05-19 4:41 ` KOSAKI Motohiro
2009-05-19 4:44 ` KOSAKI Motohiro
2009-05-19 4:48 ` Wu Fengguang
2009-05-19 5:09 ` Wu Fengguang
2009-05-19 6:27 ` Wu Fengguang
2009-05-19 6:25 ` Wu Fengguang
2009-05-20 11:20 ` Andi Kleen
2009-05-20 14:32 ` Wu Fengguang
2009-05-20 14:47 ` Andi Kleen
2009-05-20 14:56 ` Wu Fengguang
2009-05-20 15:38 ` Wu Fengguang
2009-06-08 12:14 ` Nai Xia
2009-06-08 12:46 ` Wu Fengguang
2009-06-08 15:02 ` Nai Xia
2009-06-08 7:39 ` Wu Fengguang
2009-06-08 7:51 ` KOSAKI Motohiro
2009-06-08 7:56 ` Wu Fengguang
2009-06-08 17:18 ` Nai Xia
2009-06-09 6:44 ` Wu Fengguang
2009-05-19 7:15 ` Wu Fengguang
2009-05-19 7:20 ` KOSAKI Motohiro
2009-05-19 7:49 ` Wu Fengguang
2009-05-19 8:06 ` KOSAKI Motohiro
2009-05-19 8:53 ` Wu Fengguang
2009-05-19 12:28 ` KOSAKI Motohiro
2009-05-20 1:44 ` Wu Fengguang
2009-05-20 1:59 ` KOSAKI Motohiro
2009-05-20 2:31 ` Wu Fengguang [this message]
2009-05-20 2:58 ` KOSAKI Motohiro
2009-05-19 13:24 ` Rik van Riel
2009-05-19 15:55 ` KOSAKI Motohiro
2009-05-19 6:39 ` Pekka Enberg
2009-05-19 6:56 ` KOSAKI Motohiro
2009-05-19 7:44 ` Peter Zijlstra
2009-05-19 8:05 ` Pekka Enberg
2009-05-19 8:12 ` Wu Fengguang
2009-05-19 8:14 ` Pekka Enberg
2009-05-19 13:14 ` Rik van Riel
2009-05-16 9:00 ` [PATCH 3/3] vmscan: merge duplicate code in shrink_active_list() Wu Fengguang
2009-05-16 13:39 ` Johannes Weiner
2009-05-16 13:47 ` Wu Fengguang
2009-05-16 14:35 ` Rik van Riel
2009-05-17 1:24 ` Minchan Kim
2009-05-16 14:56 ` [PATCH 0/3] make mapped executable pages the first class citizen Peter Zijlstra
2009-06-17 21:11 ` Jesse Barnes
2009-06-17 21:37 ` Jesse Barnes
2009-06-18 1:25 ` Wu Fengguang
2009-06-18 16:33 ` Jesse Barnes
2009-06-19 9:00 ` Wu, Fengguang
2009-06-19 9:04 ` Peter Zijlstra
2009-06-19 9:32 ` Wu Fengguang
2009-06-19 16:43 ` Jesse Barnes
2009-07-04 1:27 ` Roger WANG
2009-07-06 17:38 ` Jesse Barnes
-- strict thread matches above, loose matches on Subject: below --
2009-05-17 2:23 Wu Fengguang
2009-05-17 2:23 ` [PATCH 2/3] vmscan: " Wu Fengguang
2009-05-19 8:59 ` Wu Fengguang
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